diff --git a/src/main/java/io/github/dre2n/dungeonsxl/sign/RedstoneSign.java b/src/main/java/io/github/dre2n/dungeonsxl/sign/RedstoneSign.java
index 721b03c9..cae8e769 100644
--- a/src/main/java/io/github/dre2n/dungeonsxl/sign/RedstoneSign.java
+++ b/src/main/java/io/github/dre2n/dungeonsxl/sign/RedstoneSign.java
@@ -250,8 +250,12 @@ public class RedstoneSign extends DSign {
 
         unpower();
 
-        enableTask.cancel();
-        disableTask.cancel();
+        if (enableTask != null) {
+            enableTask.cancel();
+        }
+        if (disableTask != null) {
+            disableTask.cancel();
+        }
 
         active = false;
     }